EP3618606B1 - Knotter system for a baler - Google Patents
Knotter system for a baler Download PDFInfo
- Publication number
- EP3618606B1 EP3618606B1 EP18722447.2A EP18722447A EP3618606B1 EP 3618606 B1 EP3618606 B1 EP 3618606B1 EP 18722447 A EP18722447 A EP 18722447A EP 3618606 B1 EP3618606 B1 EP 3618606B1
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- European Patent Office
- Prior art keywords
- billhook
- twine
- knot
- disc
- knotter
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- 238000011144 upstream manufacturing Methods 0.000 claims description 12
- 238000010408 sweeping Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 5
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- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000036961 partial effect Effects 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
- A01F15/00—Baling presses for straw, hay or the like
- A01F15/08—Details
- A01F15/14—Tying devices specially adapted for baling presses
- A01F15/145—Twine knotters
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
- A01F15/00—Baling presses for straw, hay or the like
- A01F15/04—Plunger presses
Definitions
- the present invention relates to a knotter system, and in particular to a knotter system for a baler for forming two consecutive knots during a single knotter cycle, said knotter cycle comprising at least a first knot forming cycle and a second knot forming cycle.
- Rectangular bales are able to maintain their shape by means of a series of parallel extending twine loops, provided lengthwise around the bales.
- Known balers typically use automatic knotters by which two knots are made on every loop for binding a bale.
- An example of such a knotter system for a baler is disclosed in US 2006/0012176 in the name of the Applicant.
- the knotter system disclosed in US 2006/0012176 has the advantage that two consecutive knots can be formed during one operation cycle, without the formation of twine tails.
- the second knot is a loop knot.
- the first knot is a loop knot.
- the settings are very critical.
- the twine type and quality is critical to achieve a good result.
- the object of embodiments of the present invention is to further improve the knotter system of US 2006/0012176 and WO2014/060245 , and more in particular to improve the forming of the first and/or second knot such that a loop knot can be achieved in a less critical way. More in particular, an object of embodiments of the invention is to obtain also a good first and/or second loop knot with non-optimal settings and/or with twine having a reduced quality.
- a knotter system for performing a knotter cycle of a baler, comprising at least a first knot forming cycle and a second knot forming cycle.
- the knotter system comprises: a needle configured for delivering a needle twine; a tucker arm configured for delivering a tucker twine; a billhook assembly; and a drive means.
- the billhook assembly comprises a billhook with a lower lip and an upper lip mounted pivotally with respect to lower lip.
- the billhook is mounted rotatably around a rotation axis, preferably an inclined rotation axis.
- the drive means is adapted to make the billhook perform at least a first full rotation around its rotation axis during the first knot forming cycle and a second full rotation around its rotation axis during the second knot forming cycle.
- the drive means comprise a pinion and at least a first and second gear stretch provided along the circumference of a disc.
- the pinion is adapted to cooperate with the first and second gear stretch for making the billhook perform the first and second full rotation respectively when said disc is rotated, for forming the first and the second knot, respectively.
- the disc is provided with a recess downstream of at least one of said first gear stretch and said second gear stretch.
- An obstacle is arranged for engaging the pinion when moving in the recess.
- the recess and obstacle are configured to rotate said pinion over a determined angle and back in order to move the upper lip of the billhook away from the lower lip and back after at least one of said first full rotation and said second full rotation.
- first and/or second loop knot By rotating the pinion over a determined angle and back in order to move the upper lip of the billhook away from the lower lip and back after the first full rotation and/or after the second full rotation, the forming of a first and/or second loop knot is improved. Indeed, by briefly opening the billhook after the first full rotation and/or after the second full rotation, a first and/or second loop knot can be formed and the first and/or second loop knot is released from the billhook in a more secure manner. In that manner the knotter settings are less critical and the twine type and quality is less critical. In addition, the recess in the knotter disc and the obstacle are simple and robust features which can be easily added in existing knotter systems.
- the obstacle is a spring mounted element fixed to the disc. More preferably the obstacle is any one of the following: a spring-mounted arm, a spring mounted wheel.
- a spring-mounted obstacle is simple and robust and allows the pinion to be accurately pressed/rotated into the recess and returned/counter-rotated when released.
- the recess extends along the circumference of the disc over an angular distance of 10 - 90 degrees, preferably 20 - 60 degrees, more preferably between 30 and 50 degrees. In that manner a brief opening of the billhook is obtained which does not hinder the other moving components during the knotter cycle.
- At least one of the first gear stretch and the second gear stretch has an outer gear stretch arranged on an outwardly protruding portion of the disc, and an inner gear stretch delimited by a downstream and upstream bottom land portion; and the pinion comprises an outer teeth range configured to cooperate with the outer gear stretch, and an inner teeth range configured to cooperate with the inner gear stretch, said inner teeth range being delimited by a contact portion configured to rotate in said downstream and upstream bottom land portion and to slide over the disc when the pinion is not engaged with the first or second gear stretch.
- the recess is configured to receive the contact portion and to cause the contact portion to rotate over the determined angle and back.
- the contact portion may have a slightly curved contact surface.
- the recess, the inner gear stretch and the downstream and upstream bottom land portions are positioned on the same ring-shaped path around an axis of the disc.
- the angular distance between the recess and the downstream bottom land portion is smaller than 30 degrees, preferably smaller than 20 degrees. In that manner the additional opening of the billhook immediately follows the first and/or second full rotation of the billhook, and does not significantly impact the knotter cycle.
- the obstacle is configured to engage the outer teeth range of the pinion, such that the pinion is rotated into the recess.
- This outer teeth range protrudes out of the recess and can be easily engaged by the obstacle.
- the recess seen in a downstream direction, slopes first gradually downwardly and next gradually upwardly.
- the pinion can rotate gradually in the normal rotation direction and then in a counter-rotation direction, whilst passing over the recess.
- the billhook assembly is configured to position the upper lip away from the lower lip in a first angular range and to position the upper lip away from the lower lip in a second angular range of at least one of the first and second full rotation, wherein the first angular range is located within a range between 0° and 160°, and the second angular range is located within a range between 160° and 360°, wherein 0° corresponds with a start position of the billhook assembly.
- the twines can be moved backwards on the billhook in the direction of the pivot point between the lower lip and the upper lip, thus ensuring that the twines are properly positioned on the billhook.
- the open billhook allows to perform the knotting, wherein twines are positioned between the lower lip and the upper lip as in prior art solutions.
- the opening of the billhook in the first angular range can be done both in the first knot forming cycle and in the second knot forming cycle.
- the billhook assembly is configured to move the upper lip away from the lower lip and back a first time in the first angular range and to move the upper lip away from the lower lip a second time in the second angular range.
- the billhook may be briefly opened during the first angular range and then closed again, in order not to hinder the movement of other components, such as the swing arm, see further, during a knot forming cycle.
- the billhook assembly is configured to move the upper lip away from the lower lip in the first angular range and to move the upper lip back to the lower lip in the second angular range.
- the billhook is opened in the first angular range and remains open until the end of the first angular range.
- the billhook may e.g. be opened a little in the first angular range and then opened more in the second angular range.
- the first angular range is located within a range between 0° and 130°, preferably within a range between 0° and 90°.
- the billhook assembly comprises a cam surface, and the billhook is provided with a cam follower in contact with the cam surface.
- the cam surface may be provided with a first and a second cam configured for pushing the upper lip away from the lower lip, in the first angular range and in the second angular range, respectively, during said first full rotation and during said second full rotation.
- the cam surface may be provided with a single cam causing the billhook to open in the first angular range and to remain open in the second angular range.
- an upper lip of the billhook a suitable shape and weight such that it is opened automatically during the first angular range.
- the upper lip may be provided with a hook-like end part protruding in the direction of the lower lip.
- the hook-like end part has an inner face making an obtuse angle ⁇ with a lower face of an elongate portion of the upper lip.
- the billhook assembly is configured to position the upper lip away from the lower lip in the first angular range of the first full rotation and to position the upper lip away from the lower lip in the second angular range of the first full rotation, and to position the upper lip away from the lower lip in the first angular range of the second full rotation and to position the upper lip away from the lower lip in the second angular range of the second full rotation.
- the knotter system further comprises a twine receiver and a swing arm.
- the twine receiver may be configured for holding the needle twine and the tucker twine.
- the swing arm may be adapted for cutting twines between the billhook and the twine receiver.
- the drive means may then be further configured to move the swing arm a first time from a rest position to an extended position and back during the first knot forming cycle and a second time during the second knot forming cycle.
- the drive means comprise a cam track and a cam follower, said cam follower being connected with the swing arm, and said cam track being provided in said disc or in a member mounted for rotating synchronously with said disc, and being adapted for moving the swing arm a first time and a second time during the first and the second knot forming cycle, respectively.
- the knotter system further comprises a twine finger.
- the twine finger may be configured for guiding at least the needle twine, said twine finger being mounted moveably below the billhook and the swing arm.
- the drive means may then be further configured to move the twine finger at least a first time during the first knot forming cycle and a second time during the second knot forming cycle.
- the swing arm is configured for sweeping a formed knot from the billhook during the first knot forming cycle and during the second knot forming cycle, respectively.
- the twine receiver is adapted to let the twines slip during the second knot forming cycle so that cutting of the needle and tucker twine is avoided when forming the second knot.
- the twines By allowing the twines to slip during the second full rotation of the billhook, the cutting of the twines is avoided.
- the twine receiver comprises a twine disc and a twine holder.
- the twine holder is adapted to clamp twines against the twine disc.
- the knotter system may further comprise second drive means adapted for rotating the twine disc during a first turn whilst clamping twines for forming the first knot, and for rotating the twine disc during a second turn whilst letting twines slip for the forming of the second knot.
- the twine disc is provided with at least a first and a second notch for receiving the twines. The twines are typically in the first notch during the first turn and in the second notch during the second turn.
- the twine receiver is provided with biasing means for setting a bias for the clamping action by the twine holder.
- the biasing means may then be adapted to set a first bias during the first turn, and a second bias during the second turn.
- the first bias is chosen such that the twines are firmly clamped, while the second bias is chosen such that the twines are allowed to slip out of the twine receiver.
- the swing arm is provided with a cutter and a removal means.
- the cutter is adapted for cutting twines between the billhook and the twine receiver, whilst moving from the rest position to the extended position
- the removal means are adapted for sweeping twines from the billhook whilst moving from the rest position to the extended position.
- the removal means have a shape which is complementary to the shape of the billhook in order to facilitate the removal of the twines.
- a baler comprising a plurality of knotter systems according to any one of the embodiments defined above.
- the baler 1 illustrated in FIG. 1 has a rectangular bale case 2 that is supported by ground wheels 3.
- the bale case 2 defines a bale chamber wherein material is pushed in through a curved duct 4.
- a plunger 5 reciprocates within the bale case to intermittently pack fresh charges of material from the duct 4 rearward in the chamber in the direction of the arrow 6.
- a trigger 7 is pulled by a rod 8.
- This rod 8 engages a dog clutch 9, the clutch 9 in turn being connected to a tying mechanism 10 and a set of needles 11.
- the tying mechanism comprises a set of individual knotters 10 provided crosswise on top of the bale chamber at intervals.
- Each knotter 10 has an associated needle 11 for assisting in forming an individual loop around a finished bale.
- the dog clutch 9 connects the knotters 10 and their needles 11 via a drive chain 12 to a source of driving power to initiate the tying operation.
- the individual knotters 10 all operate in an identical manner, it suffices to describe the present invention in relation to only one such knotter 10.
- the needle 11 is swingably mounted on the bale case 2 by a pivot 13 and is swung back and forth across the bale chamber by a linkage 14, which is activated by the clutch 9.
- the needle 11 has an "at-home” or rest position fully below the bale case 2 as illustrated in FIG. 1 and a "full-throw” position extending completely across the bale case 2 as illustrated, for example, in FIG. 6C .
- the tip 20 of needle 11 has an eyelet 21 defined therein by the opposed furcations 22 and 23 of the bifurcated tip 20 in conjunction with a pair of longitudinally spaced, transversely extending rollers 24 and 25.
- a partial loop 62a which is in the process of being formed.
- the already completed bale on the right is wrapped by a loop 62 formed by a top and bottom twine 64, 66 which are knotted in the two top corners of the bale, see knots 68 and 77.
- the partial loop 62a around the bale that is being formed comprises a top twine 64a (also called tucker twine) and a bottom twine 66a (also called needle twine).
- the top twine 64a emanates from a source of twine supply 72
- the bottom twine 66a emanates from an entirely separate, second source of twine supply 74.
- a knot 68a (this is the second knot of an already executed knotter cycle where knot 70 was formed as the first knot and knot 68a as the second knot) is in existence, and the bale is approaching that length where the needle 42 is ready to swing into operation and present the twines 64a and 66a to the knotter 40 to start a knotter cycle in which two consecutive knots are being formed.
- the loop 62 is made from two strands of binding material, i.e., one strand of twine 64 along the top side of the bale and a second strand of twine 66 along the bottom side of the bale and its two opposite, vertical ends.
- the strands of twine 64 and 66 together form the continuous loop 62. Together, they fully circumscribe the bale.
- the knot 70 (this is the first knot of a knotter cycle) is typically a traditional knot.
- the knot 68, 68a of a bale (this is the second knot of a knotter cycle) may be a traditional knot or a so called loop-knot. In a loop-knot the ends of the twines 64, 64a and 66, 66a of the knot 68, 68a are released from a retained position so they can be pulled back as will be described further to form a small loop on top of the knot.
- the knot 68, 68a itself holds the ends of the twines 64, 64a and 66, 66a united with the knot 68, 68a.
- the knotter is similar in many respects to the knotters disclosed in US2006/0012176 , WO2015/014616 and WO2014/060245 in the name of the Applicant.
- FIGS. 3A-D illustrate a first embodiment of a knotter 10 according to the invention.
- the same reference numerals have been used for referring to similar elements in the different embodiments.
- the knotter 10 of FIGS. 3A-D comprises a generally circular element, also called knotter disc 501 that is secured to a drive shaft 502 for rotation with the latter through one full revolution when the clutch 9 is engaged.
- the shaft 502 is typically supported by a forwardly inclined frame 15 (see FIG. 1 ) attached to the top of the bale case 2, and the frame 15 also supports the knotter components for forming the knots in response to rotation of the knotter disc 501.
- the knotter components include a rotary billhook 100, supported by the frame 15 for rotation about an inclined axis 106 (see FIG. 5 ); a twine disc 201 rearward of and adjacent to the billhook 100 for holding top and bottom twines 64a and 66a in position for engagement by the billhook 100 during rotation of the latter; and a swing arm 400 pivotally attached to the frame 15 by a bolt 420.
- the top and bottom twines 64a and 66a are held in notches 211, 212 in the rotating twine disc 201 by a retainer or twine holder 202, see FIG. 3D .
- the tensioning force of this retainer 202 to the twine disc 201 can be adjusted manually by changing the tension of a leaf-spring 220 when a bolt is loosened or tightened.
- the billhook assembly is illustrated in detail in FIG. 4A and comprises a billhook 100 and a cam surface 110.
- the billhook 100 is shown in detail in FIG. 5 and comprises a lower lip 102, and an upper lip 101 connected around a pivot point with the lower lip 102.
- the billhook 100 performs at least a first full rotation around its rotation axis 106 during a first knot forming cycle and a second full rotation around its rotation axis 106 during a second knot forming cycle.
- a cam follower 103 which is connected to the upper lip 101, engages a cam surface 110 having a first cam 111 and a second cam 112.
- the cam follower 103 When rotating over the first cam 111 or over the second cam 112, the cam follower 103 will push the upper lip 101 away from the lower lip 102.
- the first cam 111 will cause a first opening of billhook 100 (i.e. the upper lip 101 moving away from the lower lip 102) to ensure a good positioning of the twines 64a and 66a on the billhook 100, see FIG. 6E
- the second cam 112 will cause a second opening of billhook 100 enabling the twines 64a and 66a to enter in between the two lips 101 and 102 while the billhook 100 is rotated.
- the billhook assembly is configured to position the upper lip 101 away from the lower lip 102 in a first angular range 121 of the first full rotation and to position the upper lip 101 away from the lower lip 102 in a second angular range 122 of the first full rotation.
- the first cam 111 will cause a first opening of billhook 100 to ensure a good positioning of the twines 64b and 66b on the billhook 100, see FIG. 9C
- the second cam 112 will cause a second opening of billhook 100 enabling the twines 64b and 66b to enter in between the two lips 101 and 102, see FIG. 9E .
- the billhook assembly is configured to position the upper lip 101 away from the lower lip 102 in a first angular range 121 of the second full rotation and to position the upper lip 101 away from the lower lip 102 in a second angular range 122 of the second full rotation. Since the same cam surface with the first and second cam 111, 112 is used for the first and second full rotation of billhook 100, the first and second angular ranges 121, 122 are also the same for the first and second full rotation.
- the first angular range 121 is located within a range between 0° and 160°
- the second angular range 122 is located within a range between 160° and 360°.
- the first angular range is located within a range between 0° and 130°, more preferably within a range between 0° and 90°.
- the first and second angular range are schematically illustrated in FIG. 4B .
- Reference B indicates a start position for the cam follower 103
- arrow R indicates the rotational direction of the billhook 100.
- the cam follower 103 may be positioned between the second cam 112 and the first cam 111 ( FIG. 4B ).
- the cam follower 103 may be positioned at the beginning of the first cam 111, i.e. in a position in which the billhook 100 is open ( FIG. 4B ).
- the billhook 100 is opened a first time in the first angular range 121 of the first rotation when the cam follower 103 passes over the first cam 111.
- the billhook is closed again as the cam follower leaves the first cam 111.
- the cam follower 103 enters the second angular range 122, the billhook 100 is opened a second time when it reaches the first end of the second cam 112. The same sequence is followed for the second full rotation.
- two cams 111, 112 are provided such that the upper lip 101 is moved away from the lower lip 102 and back a first time in the first angular range and moved away from the lower lip 102 and back a second time in the second angular range.
- the billhook assembly is configured to move the upper lip 101 away from the lower lip 102 in the first angular range and to move the upper lip 101 back to the lower lip 102 in the second angular range.
- the cam may be adapted such that in the first angular range the billhook 100 opens only a little whilst opening fully in the second angular range.
- the length 1 of the lower lip 102 measured from the pivot point is preferably larger than 35 mm, in order to ensure that the twines can be properly placed on the billhook 100 and do not slide off the billhook 100.
- the upper lip 101 is provided at a free end thereof with a downwardly protruding end part 104, and the lower lip 102 is provided with an end recess 105 for receiving said protruding end part. In that way the upper lip 101 can be placed against or very close to the lower lip 102 ensuring an improved stripping of the knot formed on the billhook 100.
- the drive means comprise a pinion 503 and at least a first and second gear stretch 504, 505 provided along the circumference of the knotter disc 501, see FIG. 3A-3F .
- Pinion 503 is adapted to cooperate with said first and second gear stretch 504, 505 for making the billhook 100 perform the first and second full rotation respectively when said disc is rotated for forming the first and the second knot, respectively.
- Pinion 503 is disposed for meshing engagement with at the first and a second circumferentially spaced gear stretches 504, 505 on the knotter disc 501.
- the knotter disc 501 is provided with a first recess 550 downstream of first gear stretch 504 and with a second recess 555 downstream of second gear stretch 505, when looking into the direction of movement of pinion 503 relative to knotter disk 501, see FIG. 3E . It is also possible to have only the first recess 550 or only the second recess 555. For each recess 550, 555 an obstacle 560, 565 is arranged for engaging pinion 503 when pinion 503 moves in recess 550, 555.
- the first recess 550 and the first obstacle 560 are configured to rotate pinion 503 over a determined angle and back in order to move upper lip 101 of billhook 100 away from lower lip 102 and back after the first full rotation.
- the second recess 555 and the second obstacle 565 are configured to rotate pinion 503 over a determined angle and back in order to move upper lip 101 of billhook 100 away from lower lip 102 and back after the second full rotation.
- the obstacle 560, 565 may be a spring mounted element fixed to the knotter disc 501.
- the first obstacle 560 is a spring-mounted arm and the second obstacle 565 is a spring-mounted wheel. More generally, both obstacles may be the same or different.
- Both the first recess 555 and the second recess 565 extends along the circumference of the disc over a first angular distance ⁇ 1 and a second angular distance ⁇ 2 of 10 - 90 degrees, preferably 20 - 60 degrees, more preferably between 30 and 50 degrees.
- the first gear stretch 504 has an outer gear stretch 504a arranged on an outwardly protruding portion of the knotter disc 501, and a inner gear stretch 504b delimited by a downstream and upstream bottom land portion 504c, 504d.
- the second gear stretch 505 has an outer gear stretch 505a arranged on an outwardly protruding portion of the knotter disc 501, and a inner gear stretch 505b delimited by a downstream and upstream bottom land portion 505c, 505d.
- pinion 503 comprises an outer teeth range 503a configured to cooperate with the outer gear stretch 504a, 505a, and an inner teeth range 503b configured to cooperate with the inner gear stretch 504b, 505b.
- the inner teeth range 503b is delimited by a contact portion 503c.
- Contact portion 503c is configured to rotate in the downstream and upstream bottom land portion 504c, 504d; 505c, 505d and to slide over a circumferential edge 501e of the top surface the knotter disc 501 when pinion 503 is not engaged with the first or second gear stretch 504, 505, see FIG. 3E and 3F .
- contact portion 503c has a substantially flat contact surface.
- the first and second recess 550, 555, the inner gear stretches 504b, 505b and the downstream and upstream bottom land portions 504c, 504d; 505c, 505d are positioned on the same circular path around an axis of the knotter disc 501.
- the angular distance ⁇ 1 between the first recess 550 and the downstream bottom land portion 504d is smaller than 30 degrees, more preferably smaller than 20 degrees.
- the angular distance ⁇ 2 between the first recess 555 and the downstream bottom land portion 505d is smaller than 30 degrees, more preferably smaller than 20 degrees.
- the first recess 555 is curved and, seen in a downstream direction, slopes first gradually downwardly and next gradually upwardly.
- the second recess 565 is curved and, seen in a downstream direction, slopes first gradually downwardly and next gradually upwardly.
- the first obstacle 560 is configured to engage the outer teeth range 503b of the pinion 503 whilst the pinion passes in the first recess 550.
- the second obstacle 565 is configured to engage the outer teeth range 503b of the pinion 503 whilst the pinion passes in the second recess 555.
- Pinion 503 performs a first full rotation whilst passing over the first gear stretch 504: during this rotation one outer end of contact portion 503c rotates in upstream land bottom portion 504c, and the other end of contact portion 503c rotates in downstream land bottom portion 504d.
- pinion 503 is rotated over a small angle when entering the first recess 550, and rotated back over the same small angle when leaving the first recess 550.
- pinion 503 performs a second full rotation whilst passing over the second gear stretch 505: during this rotation one outer end of contact portion 503c rotates in upstream land bottom portion 505c, and the other end of contact portion 503c rotates in downstream land bottom portion 505d.
- second recess 555 pinion 503 is rotated over a small angle when entering the second recess 565, and rotated back over the same small angle when leaving the second recess 565.
- the swing arm 400 has an arm portion 401 and a lower end portion 402 and is arranged for moving the lower end portion 402 below the billhook 100, between a backward position and a forward position.
- the lower end portion 402 comprises a heel portion 410 connected to the arm portion 401, a front portion 411, and a side portion 412.
- the side portion 412 extends between the billhook 100 and the twine disc 201 and forms the connection between an end of the heel portion 410 with an opposite end of the front portion 411.
- the side portion 412 is provided with a knife blade 403 for cutting twines between the billhook and the twine receiver whilst moving from the backward position to the forward position.
- An open area 413 is formed between the heel portion 410 and the front portion 412.
- the open area 413 is dimensioned and shaped for being accessible by the twine delivering system (needle 11 and tucker arm, see further) so that twines can be delivered through said open area 413 on the billhook 100.
- the lower end portion 402 of the swing arm 400 is shaped in such a way that there is an opening at a side facing away from the twine disc 201, said opening being located underneath the billhook 100 in a knotter position of the swing arm 400.
- the front portion 411 is provided with a stripping part 404 having an upper surface with a shape that is complementary to a shape of a lower surface of the billhook 100, see also FIG.
- the knife blade 403 will severe the twines 64a and 66a in response to a swinging movement of the arm 400 which also serves to bring the stripping part 404 in engagement with a knot formed on the billhook 100 for stripping such knot off of the billhook 100.
- the front portion 411 has a curved guidance part 405 oriented in the direction of the heel part 410.
- the curved guidance part 405 is shaped, dimensioned and arranged for guiding the twines towards the side part 412 during stripping of a formed knot, and more in particular towards the inner angle formed by the front part 411 and the side part 412.
- the heel portion 411 has a curved guidance part 406 oriented in the direction of the front part 410.
- the curved guidance part 406 is arranged for guiding the twines across the billhook during delivery and during knotting.
- Such a twine finger may be configured for guiding at least the needle twine, wherein the twine finger being mounted moveably below the billhook 100 and the swing arm 400.
- Drive means for the twine finger may then be configured to move the twine finger at least a first time during the first knot forming cycle and a second time during the second knot forming cycle.
- the additional guide finger is not required.
- Driving power is transmitted to the discs of the twine disc 201 through a twine disc pinion 602, a worm gear drive 603 and a bevel gear 604 in position for sequential meshing engagement with a pair of circumferentially spaced gear sections 605, 606 on the knotter disc 501.
- Cam follower 430 is connected with the swing arm 400.
- Cam track 440 may be provided in disc 501 or in a member mounted for rotating synchronously with disc 501, and is adapted for moving the swing arm 400 a first time and a second time during the first and the second knot forming cycle, respectively.
- a shaft 30 extends parallel with the shaft 502 to a point substantially in fore-and-aft alignment with the billhook 100, see FIG. 2 .
- the shaft 30 fixedly carries a rearward extending tucker arm 31.
- the tucker arm 31 carries a roller 33 at its rearmost end around which the strand 64a is entrained.
- a length of the strand 64a is also looped upwardly around a slacker arm 34 disposed above the tucker arm 31.
- the strand 64a may be further clamped between a pair of opposed plates (not shown) of a tensioning unit.
- the needle 11 is still in its home position.
- the bale has reached its desired length and it is time to complete the loop around the bale and make the second knot in the loop.
- the strand 64a stretches along the top of the bale directly beneath the swing arm 400 but, at least for all effective purposes, is out of contact with the knotter 10.
- the swing arm 400 moves backward, and the needle 11 swings upwardly toward the knotter 10. It carries with it the strand 66a as the latter is paid out by source 74.
- the strand 66a is threaded through the eyelet 21 of needle 11, a length of that strand on the twine source side of the needle 11 is also carried upwardly toward the knotter 10, such extra length being hereinafter denoted 66b.
- the tucker arm 31 is also moved upward, see FIG. 6A and 6B .
- the tucker arm 31 rocks upwardly in a counter-clockwise direction to provide the slack necessary in the strand 64a to accommodate the needle movement.
- the tip of the needle 11, and more particularly, the roller 25, snares the strand 64a as illustrated in FIG. 6C and presents twines 64a and 66a in unison to the knotter 10.
- the swing arm 400 is in a position to guide the twines so as to ensure that the twines 64a and 66a are both in proper position across the billhook 100, see FIG. 6D .
- the billhook is opened to ensure that the twines 64a, 66a are properly positioned over the billhook 100, at an end portion of the upper lip 101 near the pivot point with the lower lip 102.
- the guide part 406 of the heel portion 411 may help in ensuring that the twines 64a, 66a are properly placed across an upper lip 101 of the billhook 100.
- the needle 11 drapes the twines across the billhook 100, optionally with the help of the guidance part 406, and thence into awaiting notches 211 of the twine disc 201, whereupon rotation of co-operating discs in the latter, in combination with a pressing twine holder 202, serve to firmly grip the twines 64a, 66a and prevent their escape as the billhook 100 begins its rotation, see FIG. 6D , 6E , 6F and 6G .
- the swing arm 400 moves a little backward (arrow B), moving the front portion 410 away from the billhook 100, to provide additional space for the rotation of the billhook.
- the twine disc 201 rotates a quarter of a turn and clamps the twines 64a and 66a firmly together in the first notch 211. Now the needle 11 can move downward. During the down travel of the needle 11 the two twines on the back of the needles are placed in the next notch 212 of the twine disc for the second knot, see FIG. 6F and 6G . While the needle 11 goes down, the billhook 100 continues to rotate to form the first knot. During this further rotation of the billhook 100, the billhook 100 opens again, see FIG. 6G , such that the twines from first notch 211 can be positioned between the upper lip 101 and the lower lip 102. The swing arm 400 swings forward (arrow F in FIG. 6H ) to cut the twines under the twine disc with the knife blade 403 and sweeps the knot from the billhook 100 with the help of the stripping part 404.
- the twines 64a and 66a extend from in between the lips 101 and 102 towards the twine disc 201, see FIG. 6H .
- the stripping part 404 engages the twines 64a and 66a which are retained in a twisted manner around the billhook 100. In so doing, the strand parts lying on top of the upper lip 101 are pulled over the strand parts lying in between the upper and lower lips 101 and 102, thereby forming the first knot.
- the billhook 100 is briefly opened again after the first full rotation of the billhook 100, see FIG. 61 and 6J .
- first knot will be a loop knot 70a and will facilitate the releasing of the first knot from the billhook 100.
- further motion of the arm 400 also helps to strip the finished knot completely from the billhook 100 and to drop the completed loop on the bale as illustrated in FIG. 6J .
- the strand 66b of needle twine from source 74, as well as strand 64b of tucker twine from source 72 is still retained in the second notch 212 and possibly also in the first notch 211 of the twine disc 201. Consequently, as the needle 11 continues to retract, the strand 66b is draped downwardly across the bale chamber 2 thereby pushing the upper lip 101 down because of the pressure of the twines on the upper lip 101, while the tucker arm 31 lowers to its normal position. Upon reaching the condition illustrated in FIG. 9B , the strands 64b and 66b are in position for initiating the second knot forming cycle.
- the billhook is briefly opened as illustrated in FIG. 9C , in order to ensure that the strands 64a and 66b are well positioned on the billhook 100, in a similar manner as described above for the first knot forming cycle.
- the swing arm 400, and in particular guidance part 406, may help with the proper positioning of the twines 64b and 66b across and in engagement with the billhook 100.
- the billhook 100 and the twine disc 201 are operated by their second respective gear stretch 505 and gear section 606 on the knotter disc 501, see FIG.
- the twine disc 201 has a protruding ridge 213 positioned after the second notch 212, seen in a rotation direction of the disc 201, so that the twine holder 202 is moved away from the twine disc 201 when the disc is further rotated during the forming of the second knot. Because the free ends of the strands 64b and 66b are considerably longer than the free ends obtained during the first knot formation, upon finalizing the knot, the free ends of the strands 64b and 66b no longer are pulled completely out of the knot, resulting in a so-called loop-knot 68b, as best seen in FIG.
- Fig. 91 illustrates the swing arm 400 with the lower end portion in the forward position, after removal of the knot. In this position the cam follower 103 of billhook 100 is on the first cam 111, with the billhook 100 open.
- FIG. 7A illustrates a first example of a possible twine receiver 200 comprising a twine disc 201 and a twine holder 202.
- the twine disc 201 comprises a first disc 221 and a second disc 222 fixed on an axis 223.
- the twine holder comprises a first press plate 231 and a second press plate 232 intended for being inserted between the first and second disc 221, 222.
- the first press plate is intended for being in operative contact with the outer side of the first disc 221.
- the first disc 221 is provided at its inner and/or outer side with a protruding ridge 213. In the embodiment of FIG. 7A the ridge extends at both sides of the first disc 221, while in the embodiment of FIG.
- the ridge extends only at the outer side of disc 221.
- the first disc 221 is provided with an opening 224
- the ridge 213 is formed by a piece 213 that is fixed through the opening 224 on the second disc 222.
- the skilled person will understand that other shapes are possible and that it may be possible to provide more or less notches in the twine disc.
- providing the twine disc with only two notches 211, 212 spaced along the circumference at an angle which approximately 90 degrees, as in the embodiment of FIG. 7A is advantageous because this will allow the notches to be located at a lower part of the twine discs 201 when the knotter is in a non-active state. This will avoid that dirt can accumulate in the notches in the nonoperative state of the knotter.
- the pressure exerted by the leaf spring 220 could be regulated using a setting means adapted to decrease this pressure at the end of the second rotation of the billhook 100.
- the twine holder 202 could be pushed away against the force of the leaf spring 220 during the formation of the second knot.
- this regulating of the pressure/pushing away of the twine holder can be reached using any suitable mechanical or hydraulic transfer.
- an adaption of shape of the notches 211, 212 and the use of a protruding ridge 213 may be combined.
- a supplementary gear section 606' providing a prolonged operation of the twine disc 201, so that the twine disc rotates over approximately 270 degrees during the second knot forming cycle.
- This prolonged rotation in combination with the protruding ridge 213 will result in the twines 64b and 66b being no longer retained between the twine disc 201 and the twine holder 202, causing a further slipping of the twines during the forming of the second knot.
- the knife blade 403 is very sharp, it will not be able to cut the twines because instead of holding the twines, the twine disc 201 is releasing them on account of the continued rotation of the twine disc 201 and the low pressure of the twine holder 202 on the twines, while the arm 400 continues moving and stripping of the almost completed knot from the billhook 100, thus pulling the twines out of the twine disc 201.
- the supplementary gear section 606 is not necessary, and that a similar effect can be reached when the tensioning force of the leaf spring 220 to the twine holder 202 is sufficiently decreased.
- This second knot is the start of a new bight for the next bale.
- Such bight is in position to receive new material that is packed into the bale chamber by the plunger, and the bight grows in length as additional lengths of the twines 64b and 66b are simultaneously pulled from their sources 72 and 74.
- the sequence returns to its starting point, whereupon the bight is closed by operation of the needle 11 to complete the loop around the bale and form the other knot.
- the cam surface may have only the second cam 112 as in prior art solutions and the billhook 100 itself may be modified to cause the opening of the billhook in the first angular range as defined above.
- the upper lip 101 of billhook may be made heavier at the lower side of downwardly protruding end part 104.
- This additional material can be chosen such that the upper lip 101 opens in the first angular range.
- the upper lip 101 may be provided with a hook-like end part 104 protruding in the direction of the lower lip.
- the hook-like end part 104 has an inner face 104' making an obtuse angle ⁇ with a lower face 101' of an elongate portion of the upper lip 101.
- By increasing the angle ⁇ the billhook can be more easily opened by a strand.
- an appropriate compromise has to be found between the shape of the upper lip 101, and in particular of the hook-like end part 104, and the tension in strands.
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Description
- The present invention relates to a knotter system, and in particular to a knotter system for a baler for forming two consecutive knots during a single knotter cycle, said knotter cycle comprising at least a first knot forming cycle and a second knot forming cycle.
- Rectangular bales are able to maintain their shape by means of a series of parallel extending twine loops, provided lengthwise around the bales. Known balers typically use automatic knotters by which two knots are made on every loop for binding a bale. An example of such a knotter system for a baler is disclosed in
US 2006/0012176 in the name of the Applicant. The knotter system disclosed inUS 2006/0012176 has the advantage that two consecutive knots can be formed during one operation cycle, without the formation of twine tails. - Similar improved knotter systems are disclosed in patent applications in the name of the Applicant with publications numbers
WO2015/014616 ,WO2014/060245 andUS 2015/0272011 - In prior art knotter systems, it is typically desirable that the second knot is a loop knot. Also, it may be desirable that the first knot is a loop knot. To achieve good loop knots the settings are very critical. Also the twine type and quality is critical to achieve a good result.
- The object of embodiments of the present invention is to further improve the knotter system of
US 2006/0012176 andWO2014/060245 , and more in particular to improve the forming of the first and/or second knot such that a loop knot can be achieved in a less critical way. More in particular, an object of embodiments of the invention is to obtain also a good first and/or second loop knot with non-optimal settings and/or with twine having a reduced quality. - According to a first aspect there is provided a knotter system for performing a knotter cycle of a baler, comprising at least a first knot forming cycle and a second knot forming cycle. The knotter system comprises: a needle configured for delivering a needle twine; a tucker arm configured for delivering a tucker twine; a billhook assembly; and a drive means. The billhook assembly comprises a billhook with a lower lip and an upper lip mounted pivotally with respect to lower lip. The billhook is mounted rotatably around a rotation axis, preferably an inclined rotation axis.
- The drive means is adapted to make the billhook perform at least a first full rotation around its rotation axis during the first knot forming cycle and a second full rotation around its rotation axis during the second knot forming cycle. The drive means comprise a pinion and at least a first and second gear stretch provided along the circumference of a disc. The pinion is adapted to cooperate with the first and second gear stretch for making the billhook perform the first and second full rotation respectively when said disc is rotated, for forming the first and the second knot, respectively. The disc is provided with a recess downstream of at least one of said first gear stretch and said second gear stretch. An obstacle is arranged for engaging the pinion when moving in the recess. The recess and obstacle are configured to rotate said pinion over a determined angle and back in order to move the upper lip of the billhook away from the lower lip and back after at least one of said first full rotation and said second full rotation.
- By rotating the pinion over a determined angle and back in order to move the upper lip of the billhook away from the lower lip and back after the first full rotation and/or after the second full rotation, the forming of a first and/or second loop knot is improved. Indeed, by briefly opening the billhook after the first full rotation and/or after the second full rotation, a first and/or second loop knot can be formed and the first and/or second loop knot is released from the billhook in a more secure manner. In that manner the knotter settings are less critical and the twine type and quality is less critical. In addition, the recess in the knotter disc and the obstacle are simple and robust features which can be easily added in existing knotter systems.
- Preferably, the obstacle is a spring mounted element fixed to the disc. More preferably the obstacle is any one of the following: a spring-mounted arm, a spring mounted wheel. Such a spring-mounted obstacle is simple and robust and allows the pinion to be accurately pressed/rotated into the recess and returned/counter-rotated when released.
- Preferably, the recess extends along the circumference of the disc over an angular distance of 10 - 90 degrees, preferably 20 - 60 degrees, more preferably between 30 and 50 degrees. In that manner a brief opening of the billhook is obtained which does not hinder the other moving components during the knotter cycle.
- In an exemplary embodiment, at least one of the first gear stretch and the second gear stretch has an outer gear stretch arranged on an outwardly protruding portion of the disc, and an inner gear stretch delimited by a downstream and upstream bottom land portion; and the pinion comprises an outer teeth range configured to cooperate with the outer gear stretch, and an inner teeth range configured to cooperate with the inner gear stretch, said inner teeth range being delimited by a contact portion configured to rotate in said downstream and upstream bottom land portion and to slide over the disc when the pinion is not engaged with the first or second gear stretch. Such an embodiment allows for a good control of the rotation of the billhook during the first and second knot forming cycle.
- In an exemplary embodiment the recess is configured to receive the contact portion and to cause the contact portion to rotate over the determined angle and back. The contact portion may have a slightly curved contact surface.
- Preferably, the recess, the inner gear stretch and the downstream and upstream bottom land portions are positioned on the same ring-shaped path around an axis of the disc.
- Preferably, the angular distance between the recess and the downstream bottom land portion is smaller than 30 degrees, preferably smaller than 20 degrees. In that manner the additional opening of the billhook immediately follows the first and/or second full rotation of the billhook, and does not significantly impact the knotter cycle.
- Preferably the obstacle is configured to engage the outer teeth range of the pinion, such that the pinion is rotated into the recess. This outer teeth range protrudes out of the recess and can be easily engaged by the obstacle.
- Preferably the recess, seen in a downstream direction, slopes first gradually downwardly and next gradually upwardly. In that manner the pinion can rotate gradually in the normal rotation direction and then in a counter-rotation direction, whilst passing over the recess.
- In an exemplary embodiment the billhook assembly is configured to position the upper lip away from the lower lip in a first angular range and to position the upper lip away from the lower lip in a second angular range of at least one of the first and second full rotation, wherein the first angular range is located within a range between 0° and 160°, and the second angular range is located within a range between 160° and 360°, wherein 0° corresponds with a start position of the billhook assembly. By positioning the upper lip away from the lower lip in the first angular range, i.e. by opening the billhook after the twines have been draped over the billhook, the twines can be moved backwards on the billhook in the direction of the pivot point between the lower lip and the upper lip, thus ensuring that the twines are properly positioned on the billhook. In the second angular range the open billhook allows to perform the knotting, wherein twines are positioned between the lower lip and the upper lip as in prior art solutions. The opening of the billhook in the first angular range can be done both in the first knot forming cycle and in the second knot forming cycle.
- In an exemplary embodiment the billhook assembly is configured to move the upper lip away from the lower lip and back a first time in the first angular range and to move the upper lip away from the lower lip a second time in the second angular range. Such an embodiment has the advantage that the billhook may be briefly opened during the first angular range and then closed again, in order not to hinder the movement of other components, such as the swing arm, see further, during a knot forming cycle.
- In another exemplary embodiment the billhook assembly is configured to move the upper lip away from the lower lip in the first angular range and to move the upper lip back to the lower lip in the second angular range. In other words, in such an embodiment the billhook is opened in the first angular range and remains open until the end of the first angular range. In such an embodiment, the billhook may e.g. be opened a little in the first angular range and then opened more in the second angular range.
- In an exemplary embodiment the first angular range is located within a range between 0° and 130°, preferably within a range between 0° and 90°. By performing the first opening of the billhook at the beginning of the rotation, the twines can be positioned properly right at the beginning.
- In an exemplary embodiment the billhook assembly comprises a cam surface, and the billhook is provided with a cam follower in contact with the cam surface. The cam surface may be provided with a first and a second cam configured for pushing the upper lip away from the lower lip, in the first angular range and in the second angular range, respectively, during said first full rotation and during said second full rotation. In another embodiment the cam surface may be provided with a single cam causing the billhook to open in the first angular range and to remain open in the second angular range. Embodiments with a cam surface and cam follower have the advantage that the opening of the billhook is well controlled and predictable. However, it is also possible to give an upper lip of the billhook a suitable shape and weight such that it is opened automatically during the first angular range. More in particular the upper lip may be provided with a hook-like end part protruding in the direction of the lower lip. The hook-like end part has an inner face making an obtuse angle α with a lower face of an elongate portion of the upper lip. By increasing the angle the billhook can be more easily opened by a strand. When such an embodiment is used an appropriate compromise has to be found between the shape of the upper lip, and in particular of the hook-like end part, and the tension in strands.
- In an exemplary embodiment the billhook assembly is configured to position the upper lip away from the lower lip in the first angular range of the first full rotation and to position the upper lip away from the lower lip in the second angular range of the first full rotation, and to position the upper lip away from the lower lip in the first angular range of the second full rotation and to position the upper lip away from the lower lip in the second angular range of the second full rotation. In other words, it is preferred to do the opening of the billhook in the first angular range, both during the first knot forming cycle and during the second knot forming cycle. When a cam surface and upper lip with cam follower is used, it is clear that this it is desirable to use the same cam surface for the first and the second knot forming cycle, so that the opening/closing cycle of the billhook is the same during the first and the second knot forming cycle.
- In an exemplary embodiment the knotter system further comprises a twine receiver and a swing arm. The twine receiver may be configured for holding the needle twine and the tucker twine. The swing arm may be adapted for cutting twines between the billhook and the twine receiver. The drive means may then be further configured to move the swing arm a first time from a rest position to an extended position and back during the first knot forming cycle and a second time during the second knot forming cycle. In an exemplary embodiment the drive means comprise a cam track and a cam follower, said cam follower being connected with the swing arm, and said cam track being provided in said disc or in a member mounted for rotating synchronously with said disc, and being adapted for moving the swing arm a first time and a second time during the first and the second knot forming cycle, respectively.
- In an exemplary embodiment the knotter system further comprises a twine finger. The twine finger may be configured for guiding at least the needle twine, said twine finger being mounted moveably below the billhook and the swing arm. The drive means may then be further configured to move the twine finger at least a first time during the first knot forming cycle and a second time during the second knot forming cycle.
- Preferably the swing arm is configured for sweeping a formed knot from the billhook during the first knot forming cycle and during the second knot forming cycle, respectively.
- Preferably the twine receiver is adapted to let the twines slip during the second knot forming cycle so that cutting of the needle and tucker twine is avoided when forming the second knot. By allowing the twines to slip during the second full rotation of the billhook, the cutting of the twines is avoided.
- According to an exemplary embodiment, the twine receiver comprises a twine disc and a twine holder. The twine holder is adapted to clamp twines against the twine disc. The knotter system may further comprise second drive means adapted for rotating the twine disc during a first turn whilst clamping twines for forming the first knot, and for rotating the twine disc during a second turn whilst letting twines slip for the forming of the second knot. According to an exemplary embodiment, the twine disc is provided with at least a first and a second notch for receiving the twines. The twines are typically in the first notch during the first turn and in the second notch during the second turn. Note however that during the beginning of the second turn, end parts of the twines may still be in the first notch. However, during the forming of the second knot, the end parts will slip first out of the first notch and then out of the second notch. According to a possible embodiment, the second notch is shaped in such a way that the twines are allowed to slip out of the second notch during forming of the second knot. According to another possible embodiment, the twine receiver is provided with biasing means for setting a bias for the clamping action by the twine holder. The biasing means may then be adapted to set a first bias during the first turn, and a second bias during the second turn. The first bias is chosen such that the twines are firmly clamped, while the second bias is chosen such that the twines are allowed to slip out of the twine receiver.
- According to a preferred embodiment, the swing arm is provided with a cutter and a removal means. The cutter is adapted for cutting twines between the billhook and the twine receiver, whilst moving from the rest position to the extended position, and the removal means are adapted for sweeping twines from the billhook whilst moving from the rest position to the extended position. Typically, the removal means have a shape which is complementary to the shape of the billhook in order to facilitate the removal of the twines.
- According to another aspect of the invention there is provided a baler comprising a plurality of knotter systems according to any one of the embodiments defined above.
- The advantages of this invention will be apparent upon consideration of the following detailed disclosure of exemplary non-limiting embodiments of the invention, especially when taken in conjunction with the accompanying drawings wherein:
-
FIG. 1 is a fragmentary, side elevational view of a baler having a double knotter tying mechanism; -
FIG. 1A is a detailed view of a needle end portion; -
FIG. 2 is a diagrammatic view of a complete and a partial double-knotted loop without the forming of twine tails; -
FIGS. 3A-3D are exploded perspective views of an exemplary embodiment of a double knotter system of the invention, looking from different angles; -
FIG. 3E is a top view of an exemplary embodiment of a knotter disc of a double knotter system of the invention; -
FIG. 3F is a perspective view of a pinion for use in the exemplary embodiments offigures 3A-3E ; -
FIG. 4A , is a perspective view of a billhook assembly according to an embodiment; -
FIG. 4B is a schematic bottom view of the cam surface of the billhook assembly ofFIG. 4A . -
FIG. 5 is a perspective view of an exemplary embodiment of a billhook; -
FIGS. 6A to 6J are fragmentary, schematic views illustrating the successive steps of a first knot forming cycle of a double-knotting operation. -
FIG. 7A is a perspective view of a first exemplary embodiment of a twine receiver; -
FIG. 7B is a perspective view of a second exemplary embodiment of a twine receiver; and -
FIG. 8 is a schematic view of a modified upper lip of a billhook according to an exemplary embodiment. -
FIGS. 9A to 91 are fragmentary, schematic views illustrating the successive steps of a second knot forming cycle of a double-knotting operation. - In the description which follows and in certain passages already set forth, the principles of the present invention will be described in terms of "twine" and "knots" formed in such twine.
- However, it is to be recognized that such principles extend to wire and twisted junctions of wire as well as twine and knots.
- Many of the fastening, and connection processes, and other means and components utilized in this invention are widely known and used in the field of the invention described, and their exact nature or type is not necessary for an understanding and use of the invention by a person skilled in the art, and therefore they will not be discussed in significant detail. Also, any reference herein to the terms "left" or "right" are used as a matter of mere convenience, and are determined by standing at the rear of the machine facing in its normal direction of travel.
- The
baler 1 illustrated inFIG. 1 has arectangular bale case 2 that is supported byground wheels 3. Thebale case 2 defines a bale chamber wherein material is pushed in through a curved duct 4. Aplunger 5 reciprocates within the bale case to intermittently pack fresh charges of material from the duct 4 rearward in the chamber in the direction of the arrow 6. When the bale reaches a predetermined size, a trigger 7 is pulled by a rod 8. This rod 8 engages a dog clutch 9, the clutch 9 in turn being connected to a tyingmechanism 10 and a set ofneedles 11. As will be appreciated, the tying mechanism comprises a set ofindividual knotters 10 provided crosswise on top of the bale chamber at intervals. Eachknotter 10 has an associatedneedle 11 for assisting in forming an individual loop around a finished bale. When the bale needs tying, the dog clutch 9 connects the knotters 10 and theirneedles 11 via adrive chain 12 to a source of driving power to initiate the tying operation. As theindividual knotters 10 all operate in an identical manner, it suffices to describe the present invention in relation to only onesuch knotter 10. - The
needle 11 is swingably mounted on thebale case 2 by apivot 13 and is swung back and forth across the bale chamber by alinkage 14, which is activated by the clutch 9. Theneedle 11 has an "at-home" or rest position fully below thebale case 2 as illustrated inFIG. 1 and a "full-throw" position extending completely across thebale case 2 as illustrated, for example, inFIG. 6C . As illustrated inFIG. 1A , thetip 20 ofneedle 11 has aneyelet 21 defined therein by the opposed furcations 22 and 23 of thebifurcated tip 20 in conjunction with a pair of longitudinally spaced, transversely extendingrollers - With reference to
FIG. 2 , to the left ofloop 62 is apartial loop 62a which is in the process of being formed. The already completed bale on the right is wrapped by aloop 62 formed by a top andbottom twine knots 68 and 77. Thepartial loop 62a around the bale that is being formed comprises atop twine 64a (also called tucker twine) and abottom twine 66a (also called needle twine). Thetop twine 64a emanates from a source oftwine supply 72, while thebottom twine 66a emanates from an entirely separate, second source oftwine supply 74. At the particular point in the sequence chosen for illustration, aknot 68a (this is the second knot of an already executed knotter cycle whereknot 70 was formed as the first knot andknot 68a as the second knot) is in existence, and the bale is approaching that length where the needle 42 is ready to swing into operation and present thetwines loop 62 is made from two strands of binding material, i.e., one strand oftwine 64 along the top side of the bale and a second strand oftwine 66 along the bottom side of the bale and its two opposite, vertical ends. The strands oftwine continuous loop 62. Together, they fully circumscribe the bale. The knot 70 (this is the first knot of a knotter cycle) is typically a traditional knot. Theknot twines knot knot twines knot - The knotter is similar in many respects to the knotters disclosed in
US2006/0012176 ,WO2015/014616 andWO2014/060245 in the name of the Applicant. - With this short explanation in mind, the details of the embodiments according to the present invention will now be described.
FIGS. 3A-D illustrate a first embodiment of aknotter 10 according to the invention. For convenience the same reference numerals have been used for referring to similar elements in the different embodiments. - The
knotter 10 ofFIGS. 3A-D comprises a generally circular element, also calledknotter disc 501 that is secured to adrive shaft 502 for rotation with the latter through one full revolution when the clutch 9 is engaged. Theshaft 502 is typically supported by a forwardly inclined frame 15 (seeFIG. 1 ) attached to the top of thebale case 2, and theframe 15 also supports the knotter components for forming the knots in response to rotation of theknotter disc 501. - The knotter components include a
rotary billhook 100, supported by theframe 15 for rotation about an inclined axis 106 (seeFIG. 5 ); atwine disc 201 rearward of and adjacent to thebillhook 100 for holding top andbottom twines billhook 100 during rotation of the latter; and aswing arm 400 pivotally attached to theframe 15 by abolt 420. The top andbottom twines notches rotating twine disc 201 by a retainer ortwine holder 202, seeFIG. 3D . The tensioning force of thisretainer 202 to thetwine disc 201 can be adjusted manually by changing the tension of a leaf-spring 220 when a bolt is loosened or tightened. - The billhook assembly is illustrated in detail in
FIG. 4A and comprises abillhook 100 and acam surface 110. Thebillhook 100 is shown in detail inFIG. 5 and comprises alower lip 102, and anupper lip 101 connected around a pivot point with thelower lip 102. During a tying cycle, thebillhook 100 performs at least a first full rotation around itsrotation axis 106 during a first knot forming cycle and a second full rotation around itsrotation axis 106 during a second knot forming cycle. When thebillhook 100 rotates around itsaxis 106, acam follower 103, which is connected to theupper lip 101, engages acam surface 110 having afirst cam 111 and asecond cam 112. When rotating over thefirst cam 111 or over thesecond cam 112, thecam follower 103 will push theupper lip 101 away from thelower lip 102. As will be explained in detail below, during the first knot forming cycle, thefirst cam 111 will cause a first opening of billhook 100 (i.e. theupper lip 101 moving away from the lower lip 102) to ensure a good positioning of thetwines billhook 100, seeFIG. 6E , and thesecond cam 112 will cause a second opening ofbillhook 100 enabling thetwines lips billhook 100 is rotated. In other words, the billhook assembly is configured to position theupper lip 101 away from thelower lip 102 in a firstangular range 121 of the first full rotation and to position theupper lip 101 away from thelower lip 102 in a secondangular range 122 of the first full rotation. Similarly, as will be explained in detail below, during the second knot forming cycle, thefirst cam 111 will cause a first opening ofbillhook 100 to ensure a good positioning of thetwines billhook 100, seeFIG. 9C , and thesecond cam 112 will cause a second opening ofbillhook 100 enabling thetwines lips FIG. 9E . In other words, the billhook assembly is configured to position theupper lip 101 away from thelower lip 102 in a firstangular range 121 of the second full rotation and to position theupper lip 101 away from thelower lip 102 in a secondangular range 122 of the second full rotation. Since the same cam surface with the first andsecond cam billhook 100, the first and second angular ranges 121, 122 are also the same for the first and second full rotation. The firstangular range 121 is located within a range between 0° and 160°, and the secondangular range 122 is located within a range between 160° and 360°. Preferably, the first angular range is located within a range between 0° and 130°, more preferably within a range between 0° and 90°. - The first and second angular range are schematically illustrated in
FIG. 4B . Reference B indicates a start position for thecam follower 103, and arrow R indicates the rotational direction of thebillhook 100. In the start position B thecam follower 103 may be positioned between thesecond cam 112 and the first cam 111 (FIG. 4B ). Alternatively, in the start position B, thecam follower 103 may be positioned at the beginning of thefirst cam 111, i.e. in a position in which thebillhook 100 is open (FIG. 4B ). When the first rotation starts, thebillhook 100 is opened a first time in the firstangular range 121 of the first rotation when thecam follower 103 passes over thefirst cam 111. Next the billhook is closed again as the cam follower leaves thefirst cam 111. When thecam follower 103 enters the secondangular range 122, thebillhook 100 is opened a second time when it reaches the first end of thesecond cam 112. The same sequence is followed for the second full rotation. - In the illustrated embodiment two
cams upper lip 101 is moved away from thelower lip 102 and back a first time in the first angular range and moved away from thelower lip 102 and back a second time in the second angular range. However, in other embodiments there could be provided one long cam extending from the firstangular range 121 to the secondangular range 122, such that thebillhook 100 remains open, and does not close fully between the two ranges. In other words, the billhook assembly is configured to move theupper lip 101 away from thelower lip 102 in the first angular range and to move theupper lip 101 back to thelower lip 102 in the second angular range. For example, the cam may be adapted such that in the first angular range thebillhook 100 opens only a little whilst opening fully in the second angular range. - The
length 1 of thelower lip 102 measured from the pivot point is preferably larger than 35 mm, in order to ensure that the twines can be properly placed on thebillhook 100 and do not slide off thebillhook 100. Theupper lip 101 is provided at a free end thereof with a downwardly protrudingend part 104, and thelower lip 102 is provided with anend recess 105 for receiving said protruding end part. In that way theupper lip 101 can be placed against or very close to thelower lip 102 ensuring an improved stripping of the knot formed on thebillhook 100. - The foregoing described movement on the part of the
billhook 100 and thetwine disc 201 are brought about by operable inter-engagement of the gear stretches 504, 505 andgear sections knotter disc 501 with theirrespective gears billhook 100 and thetwine disc 201. - Now the drive means adapted to make the
billhook 100 perform at least a first full rotation around itsrotation axis 106 during the first knot forming cycle and a second full rotation around itsrotation axis 106 during the second knot forming cycle will be described in more detail. The drive means comprise apinion 503 and at least a first andsecond gear stretch knotter disc 501, seeFIG. 3A-3F .Pinion 503 is adapted to cooperate with said first andsecond gear stretch billhook 100 perform the first and second full rotation respectively when said disc is rotated for forming the first and the second knot, respectively.Pinion 503 is disposed for meshing engagement with at the first and a second circumferentially spaced gear stretches 504, 505 on theknotter disc 501. - The
knotter disc 501 is provided with afirst recess 550 downstream offirst gear stretch 504 and with asecond recess 555 downstream ofsecond gear stretch 505, when looking into the direction of movement ofpinion 503 relative toknotter disk 501, seeFIG. 3E . It is also possible to have only thefirst recess 550 or only thesecond recess 555. For eachrecess obstacle pinion 503 whenpinion 503 moves inrecess first recess 550 and thefirst obstacle 560 are configured to rotatepinion 503 over a determined angle and back in order to moveupper lip 101 ofbillhook 100 away fromlower lip 102 and back after the first full rotation. Thesecond recess 555 and thesecond obstacle 565 are configured to rotatepinion 503 over a determined angle and back in order to moveupper lip 101 ofbillhook 100 away fromlower lip 102 and back after the second full rotation. - The
obstacle knotter disc 501. In the illustrated embodiment thefirst obstacle 560 is a spring-mounted arm and thesecond obstacle 565 is a spring-mounted wheel. More generally, both obstacles may be the same or different. - Both the
first recess 555 and thesecond recess 565 extends along the circumference of the disc over a first angular distance α1 and a second angular distance α2 of 10 - 90 degrees, preferably 20 - 60 degrees, more preferably between 30 and 50 degrees. - As best illustrated in
FIG. 3E , thefirst gear stretch 504 has anouter gear stretch 504a arranged on an outwardly protruding portion of theknotter disc 501, and ainner gear stretch 504b delimited by a downstream and upstreambottom land portion 504c, 504d. Similarly, thesecond gear stretch 505 has anouter gear stretch 505a arranged on an outwardly protruding portion of theknotter disc 501, and ainner gear stretch 505b delimited by a downstream and upstreambottom land portion FIG. 3F ,pinion 503 comprises an outer teeth range 503a configured to cooperate with theouter gear stretch inner gear stretch contact portion 503c.Contact portion 503c is configured to rotate in the downstream and upstreambottom land portion 504c, 504d; 505c, 505d and to slide over acircumferential edge 501e of the top surface theknotter disc 501 whenpinion 503 is not engaged with the first orsecond gear stretch FIG. 3E and 3F . Preferably contactportion 503c has a substantially flat contact surface. The first andsecond recess bottom land portions 504c, 504d; 505c, 505d are positioned on the same circular path around an axis of theknotter disc 501. Preferably, the angular distance β1 between thefirst recess 550 and the downstream bottom land portion 504d is smaller than 30 degrees, more preferably smaller than 20 degrees. Similarly, the angular distance β2 between thefirst recess 555 and the downstreambottom land portion 505d is smaller than 30 degrees, more preferably smaller than 20 degrees. Thefirst recess 555 is curved and, seen in a downstream direction, slopes first gradually downwardly and next gradually upwardly. Similarly, thesecond recess 565 is curved and, seen in a downstream direction, slopes first gradually downwardly and next gradually upwardly. - The
first obstacle 560 is configured to engage the outer teeth range 503b of thepinion 503 whilst the pinion passes in thefirst recess 550. Similarly, thesecond obstacle 565 is configured to engage the outer teeth range 503b of thepinion 503 whilst the pinion passes in thesecond recess 555. -
Pinion 503 performs a first full rotation whilst passing over the first gear stretch 504: during this rotation one outer end ofcontact portion 503c rotates in upstreamland bottom portion 504c, and the other end ofcontact portion 503c rotates in downstream land bottom portion 504d. Next, when passing infirst recess 550pinion 503 is rotated over a small angle when entering thefirst recess 550, and rotated back over the same small angle when leaving thefirst recess 550. Then pinion 503 performs a second full rotation whilst passing over the second gear stretch 505: during this rotation one outer end ofcontact portion 503c rotates in upstreamland bottom portion 505c, and the other end ofcontact portion 503c rotates in downstreamland bottom portion 505d. Next, when passing insecond recess 555pinion 503 is rotated over a small angle when entering thesecond recess 565, and rotated back over the same small angle when leaving thesecond recess 565. - As best illustrated in
FIG. 3C , theswing arm 400 has anarm portion 401 and alower end portion 402 and is arranged for moving thelower end portion 402 below thebillhook 100, between a backward position and a forward position. Thelower end portion 402 comprises aheel portion 410 connected to thearm portion 401, afront portion 411, and aside portion 412. Theside portion 412 extends between thebillhook 100 and thetwine disc 201 and forms the connection between an end of theheel portion 410 with an opposite end of thefront portion 411. Theside portion 412 is provided with aknife blade 403 for cutting twines between the billhook and the twine receiver whilst moving from the backward position to the forward position. Anopen area 413 is formed between theheel portion 410 and thefront portion 412. Theopen area 413 is dimensioned and shaped for being accessible by the twine delivering system (needle 11 and tucker arm, see further) so that twines can be delivered through saidopen area 413 on thebillhook 100. In other words, thelower end portion 402 of theswing arm 400 is shaped in such a way that there is an opening at a side facing away from thetwine disc 201, said opening being located underneath thebillhook 100 in a knotter position of theswing arm 400. Thefront portion 411 is provided with a strippingpart 404 having an upper surface with a shape that is complementary to a shape of a lower surface of thebillhook 100, see alsoFIG. 6A and 6B , so that a formed knot can be stripped from thebillhook 100 whilst moving the swing arm from the backward position to the forward position. In other words theknife blade 403 will severe thetwines arm 400 which also serves to bring the strippingpart 404 in engagement with a knot formed on thebillhook 100 for stripping such knot off of thebillhook 100. Further, thefront portion 411 has acurved guidance part 405 oriented in the direction of theheel part 410. Thecurved guidance part 405 is shaped, dimensioned and arranged for guiding the twines towards theside part 412 during stripping of a formed knot, and more in particular towards the inner angle formed by thefront part 411 and theside part 412. Theheel portion 411 has acurved guidance part 406 oriented in the direction of thefront part 410. Thecurved guidance part 406 is arranged for guiding the twines across the billhook during delivery and during knotting. There may be provided an additional guide finger (not shown) to guide the twines before/during/after knotting, as in prior art solutions. Such a twine finger may be configured for guiding at least the needle twine, wherein the twine finger being mounted moveably below thebillhook 100 and theswing arm 400. Drive means for the twine finger may then be configured to move the twine finger at least a first time during the first knot forming cycle and a second time during the second knot forming cycle. However, in view of theguidance parts - Driving power is transmitted to the discs of the
twine disc 201 through atwine disc pinion 602, aworm gear drive 603 and abevel gear 604 in position for sequential meshing engagement with a pair of circumferentially spacedgear sections knotter disc 501. - Power to swing the
arm 400 about thepivot bolt 420 is obtained through acam follower 430 at the upper end of thearm 400 beyond thepivot bolt 420, which is disposed within acam track 440 on theknotter disc 501. A pair of circumferentially spaced cam shoulders 442 and 444 in thetrack 440 is positioned to sequentially engage thefollower 430 to operate the latter.Cam follower 430 is connected with theswing arm 400.Cam track 440 may be provided indisc 501 or in a member mounted for rotating synchronously withdisc 501, and is adapted for moving the swing arm 400 a first time and a second time during the first and the second knot forming cycle, respectively. - A
shaft 30 extends parallel with theshaft 502 to a point substantially in fore-and-aft alignment with thebillhook 100, seeFIG. 2 . At that location, theshaft 30 fixedly carries a rearward extendingtucker arm 31. Thetucker arm 31 carries aroller 33 at its rearmost end around which thestrand 64a is entrained. A length of thestrand 64a is also looped upwardly around aslacker arm 34 disposed above thetucker arm 31. Thestrand 64a may be further clamped between a pair of opposed plates (not shown) of a tensioning unit. - In
FIG. 2 , theneedle 11 is still in its home position. At this point in the bale forming operation, the bale has reached its desired length and it is time to complete the loop around the bale and make the second knot in the loop. It is remarked that at this specific instance, thestrand 64a stretches along the top of the bale directly beneath theswing arm 400 but, at least for all effective purposes, is out of contact with theknotter 10. Theswing arm 400 moves backward, and theneedle 11 swings upwardly toward theknotter 10. It carries with it thestrand 66a as the latter is paid out bysource 74. Note that because thestrand 66a is threaded through theeyelet 21 ofneedle 11, a length of that strand on the twine source side of theneedle 11 is also carried upwardly toward theknotter 10, such extra length being hereinafter denoted 66b. As theneedle 11 approaches theknotter 10, thetucker arm 31 is also moved upward, seeFIG. 6A and 6B . Thetucker arm 31 rocks upwardly in a counter-clockwise direction to provide the slack necessary in thestrand 64a to accommodate the needle movement. The tip of theneedle 11, and more particularly, theroller 25, snares thestrand 64a as illustrated inFIG. 6C and presentstwines knotter 10. - While the
twines billhook 100 to thetwine disc 201, theswing arm 400 is in a position to guide the twines so as to ensure that thetwines billhook 100, seeFIG. 6D . Next, as shown inFIG. 6E , the billhook is opened to ensure that thetwines billhook 100, at an end portion of theupper lip 101 near the pivot point with thelower lip 102. Further theguide part 406 of theheel portion 411 may help in ensuring that thetwines upper lip 101 of thebillhook 100. - In presenting the
twines needle 11 drapes the twines across thebillhook 100, optionally with the help of theguidance part 406, and thence into awaitingnotches 211 of thetwine disc 201, whereupon rotation of co-operating discs in the latter, in combination with apressing twine holder 202, serve to firmly grip thetwines billhook 100 begins its rotation, seeFIG. 6D ,6E ,6F and6G . At that time theswing arm 400 moves a little backward (arrow B), moving thefront portion 410 away from thebillhook 100, to provide additional space for the rotation of the billhook. - Typically, the
twine disc 201 rotates a quarter of a turn and clamps thetwines first notch 211. Now theneedle 11 can move downward. During the down travel of theneedle 11 the two twines on the back of the needles are placed in thenext notch 212 of the twine disc for the second knot, seeFIG. 6F and6G . While theneedle 11 goes down, thebillhook 100 continues to rotate to form the first knot. During this further rotation of thebillhook 100, thebillhook 100 opens again, seeFIG. 6G , such that the twines fromfirst notch 211 can be positioned between theupper lip 101 and thelower lip 102. Theswing arm 400 swings forward (arrow F inFIG. 6H ) to cut the twines under the twine disc with theknife blade 403 and sweeps the knot from thebillhook 100 with the help of the strippingpart 404. - The foregoing described movement on the part of the
billhook 100 and thetwine disc 201 are brought about by operable inter-engagement of thegear stretch 504 andgear section 605 on theknotter disc 501 with theirrespective gears billhook 100 and thetwine disc 201. Such driving inter-engagement continues until a knot has been formed on thebillhook 100, by which time theneedle 11 has begun to withdraw. At this point, thecam shoulder 442 of theknotter disc 501 comes into engagement with theroller 430 of thearm 400 so as to swing the bottom of the latter, and hence theknife 403, across that portion of the twines between thebillhook 100 and thetwine disc 201, thereby severing the same. At the moment of cutting, thetwines lips twine disc 201, seeFIG. 6H . To complete the knot formation, the strippingpart 404 engages thetwines billhook 100. In so doing, the strand parts lying on top of theupper lip 101 are pulled over the strand parts lying in between the upper andlower lips first recess 550 andfirst obstacle 560, thebillhook 100 is briefly opened again after the first full rotation of thebillhook 100, see FIG. 61 and6J . This will allow the first knot to be aloop knot 70a and will facilitate the releasing of the first knot from thebillhook 100. Besides completing the knot, further motion of thearm 400 also helps to strip the finished knot completely from thebillhook 100 and to drop the completed loop on the bale as illustrated inFIG. 6J . - When the knot is dropped by the
knotter 10, thestrand 66b of needle twine fromsource 74, as well asstrand 64b of tucker twine fromsource 72 is still retained in thesecond notch 212 and possibly also in thefirst notch 211 of thetwine disc 201. Consequently, as theneedle 11 continues to retract, thestrand 66b is draped downwardly across thebale chamber 2 thereby pushing theupper lip 101 down because of the pressure of the twines on theupper lip 101, while thetucker arm 31 lowers to its normal position. Upon reaching the condition illustrated inFIG. 9B , thestrands FIG. 9C , in order to ensure that thestrands billhook 100, in a similar manner as described above for the first knot forming cycle. Theswing arm 400, and inparticular guidance part 406, may help with the proper positioning of thetwines billhook 100. Next thebillhook 100 and thetwine disc 201 are operated by their secondrespective gear stretch 505 andgear section 606 on theknotter disc 501, seeFIG. 9D ,9E and 9F , wherein thebillhook 100 is opened a second time in a second angular range of the second rotation, whilst thecam follower 103 thereof passes over thesecond cam 112. Next, due to the presence ofsecond recess 555 andsecond obstacle 565, thebillhook 100 is briefly opened again after the second full rotation of thebillhook 100, seeFIG. 9G and 9H . This allows the second knot to be aloop knot 70a and facilitates the releasing of the second knot from thebillhook 100. - Thus, the second knot becomes formed, whereupon the
arm 400 is once again actuated, but this time by thesecond cam shoulder 444. Preferably thetwine disc 201 has a protrudingridge 213 positioned after thesecond notch 212, seen in a rotation direction of thedisc 201, so that thetwine holder 202 is moved away from thetwine disc 201 when the disc is further rotated during the forming of the second knot. Because the free ends of thestrands strands FIG. 9F-9H and inFIG. 2 . Fig. 91 illustrates theswing arm 400 with the lower end portion in the forward position, after removal of the knot. In this position thecam follower 103 ofbillhook 100 is on thefirst cam 111, with thebillhook 100 open. -
FIG. 7A illustrates a first example of apossible twine receiver 200 comprising atwine disc 201 and atwine holder 202. Thetwine disc 201 comprises afirst disc 221 and asecond disc 222 fixed on anaxis 223. The twine holder comprises afirst press plate 231 and asecond press plate 232 intended for being inserted between the first andsecond disc first disc 221. Thefirst disc 221 is provided at its inner and/or outer side with a protrudingridge 213. In the embodiment ofFIG. 7A the ridge extends at both sides of thefirst disc 221, while in the embodiment ofFIG. 7B the ridge extends only at the outer side ofdisc 221. In the variant offigure 7A , thefirst disc 221 is provided with anopening 224, and theridge 213 is formed by apiece 213 that is fixed through theopening 224 on thesecond disc 222. The skilled person will understand that other shapes are possible and that it may be possible to provide more or less notches in the twine disc. However, providing the twine disc with only twonotches FIG. 7A , is advantageous because this will allow the notches to be located at a lower part of thetwine discs 201 when the knotter is in a non-active state. This will avoid that dirt can accumulate in the notches in the nonoperative state of the knotter. - According to an alternative variant the pressure exerted by the
leaf spring 220 could be regulated using a setting means adapted to decrease this pressure at the end of the second rotation of thebillhook 100. According to yet another possibility thetwine holder 202 could be pushed away against the force of theleaf spring 220 during the formation of the second knot. The skilled person understands that this regulating of the pressure/pushing away of the twine holder can be reached using any suitable mechanical or hydraulic transfer. Also, instead of providing the spring means 220, there could be provided a different actuator for biasing thetwine holder 202. Finally the skilled person understands that an adaption of shape of thenotches protruding ridge 213 may be combined. - As illustrated in
FIG. 3A-3D , there may be provided a supplementary gear section 606' providing a prolonged operation of thetwine disc 201, so that the twine disc rotates over approximately 270 degrees during the second knot forming cycle. This prolonged rotation in combination with the protrudingridge 213 will result in thetwines twine disc 201 and thetwine holder 202, causing a further slipping of the twines during the forming of the second knot. Indeed, even though theknife blade 403 is very sharp, it will not be able to cut the twines because instead of holding the twines, thetwine disc 201 is releasing them on account of the continued rotation of thetwine disc 201 and the low pressure of thetwine holder 202 on the twines, while thearm 400 continues moving and stripping of the almost completed knot from thebillhook 100, thus pulling the twines out of thetwine disc 201. The skilled person understands that thesupplementary gear section 606 is not necessary, and that a similar effect can be reached when the tensioning force of theleaf spring 220 to thetwine holder 202 is sufficiently decreased. - This second knot is the start of a new bight for the next bale. Such bight is in position to receive new material that is packed into the bale chamber by the plunger, and the bight grows in length as additional lengths of the
twines sources needle 11 to complete the loop around the bale and form the other knot. - In yet another embodiment the cam surface may have only the
second cam 112 as in prior art solutions and thebillhook 100 itself may be modified to cause the opening of the billhook in the first angular range as defined above. For example, as illustrated inFIG. 8 theupper lip 101 of billhook may be made heavier at the lower side of downwardly protrudingend part 104. This additional material can be chosen such that theupper lip 101 opens in the first angular range. More in particular theupper lip 101 may be provided with a hook-like end part 104 protruding in the direction of the lower lip. The hook-like end part 104 has an inner face 104' making an obtuse angle α with a lower face 101' of an elongate portion of theupper lip 101. By increasing the angle α the billhook can be more easily opened by a strand. When such an embodiment is used an appropriate compromise has to be found between the shape of theupper lip 101, and in particular of the hook-like end part 104, and the tension in strands. - While the principles of the invention have been set out above in connection with specific embodiments, it is to be understood that this description is merely made by way of example and not as a limitation of the scope of protection, which is determined by the appended claims.
Claims (19)
- A knotter system for performing a knotter cycle of a baler, said knotter cycle comprising at least a first knot forming cycle and a second knot forming cycle, said knotter system comprising:a needle (11) configured for delivering a needle twine;a tucker arm (31) configured for delivering a tucker twine;a billhook assembly comprising a billhook (100) with a lower lip (102) and an upper lip (101) mounted pivotally with respect to lower lip (102), said billhook (100) being mounted rotatably around a rotation axis (106) and being arranged for receiving the needle twine and the tucker twine;a drive means adapted to make the billhook (100) perform at least a first full rotation around its rotation axis (106) during the first knot forming cycle and a second full rotation around its rotation axis (106) during the second knot forming cycle;wherein the drive means comprise a pinion (503) and at least a first and second gear stretch (504, 505) provided along the circumference of a disc (501), said pinion (503) being adapted to cooperate with said first and second gear stretch (504, 505) for making the billhook (100) perform the first and second full rotation respectively when said disc (501) is rotated for forming the first and the second knot, respectively;characterized in that the disc (501) is provided with a recess (550; 555) downstream of at least one of said first gear stretch (504) and said second gear stretch (505), wherein an obstacle (560; 565) is arranged for engaging the pinion (503) when moving in the recess (550; 555) , wherein said recess (550; 555) and said obstacle (560; 565) are configured to rotate said pinion (503) over a determined angle and back in order to move the upper lip of the billhook away from the lower lip and back after at least one of said first full rotation and said second full rotation.
- The knotter system of claim 1, wherein the obstacle (560; 565) is a spring mounted element fixed to the disc (501).
- The knotter system of claim 1 or 2, wherein the recess (550; 555) extends along the circumference of the disc (501) over an angular distance of 10 - 90 degrees, preferably 20 - 60 degrees, more preferably between 30 and 50 degrees.
- The knotter system of any one of the previous claims, wherein the obstacle (560; 565) is any one of the following: a spring-mounted arm, a spring mounted wheel.
- The knotter system of any one of the previous claims, wherein at least one of the first gear stretch (504) and the second gear stretch (505) has an outer gear stretch (504a; 505a) arranged on an outwardly protruding portion of the disc (501), and a inner gear stretch (504b; 505b) delimited by a downstream and upstream bottom land portion (504c, 504d; 505c, 505d); and
wherein said pinion (503) comprises an outer teeth range (503a) configured to cooperate with the outer gear stretch (504a; 505a), and an inner teeth range (503b) configured to cooperate with the inner gear stretch (504b; 505b), said inner teeth range (503b) being delimited by a contact portion (503c) configured to rotate in said downstream and upstream bottom land portion and to slide over the disc (501) when the pinion (503) is not engaged with the first or second gear stretch (505). - The knotter system of claim 5, wherein the recess (550; 555) is configured to receive the contact portion (503c) and to cause the contact portion (503c) to rotate over the determined angle and back, wherein the contact portion (503c) preferably has a slightly curved contact surface.
- The knotter system of claim 5 or 6, wherein the recess (550; 555), the inner gear stretch (504b; 505b) and the downstream and upstream bottom land portions (504c, 504d; 505c, 505d) are positioned on the same circular path around an axis of the disc (501).
- The knotter system of any one of the claims 5-7, wherein the angular distance between the recess (550; 555) and the downstream bottom land portion (504d; 505d) is smaller than 30 degrees, preferably smaller than 20 degrees.
- The knotter system of any one of the claims 5-8, wherein the obstacle (560; 565) is configured to engage the outer teeth range of the pinion (503).
- The knotter system of any one of the claims 5-9, wherein the recess (550; 555), seen in a downstream direction, slopes first gradually downwardly and next gradually upwardly.
- The knotter system of any one of the previous claims, wherein the billhook assembly is configured to position the upper lip (101) away from the lower lip (102) in a first angular range and to position the upper lip (101) away from the lower lip (102) in a second angular range of at least one of the first and second full rotation, wherein the first angular range is located within a range between 0° and 160°, and the second angular range is located within a range between 160° and 360°.
- The knotter system of claim 11, wherein the billhook assembly is configured to move the upper lip (101) away from the lower lip (102) and back a first time in the first angular range and to move the upper lip (101) away from the lower lip (102) a second time in the second angular range.
- The knotter system of any one of the previous claims, wherein the billhook assembly comprises a cam surface (110), and wherein the billhook (100) is provided with a cam follower in contact with the cam surface (110), said cam surface being configured for moving the upper lip (101) away from the lower lip (102).
- The knotter system of claim 11 or 12 in combination with claim 13, wherein the cam surface (110) is provided with a first and a second cam (111, 112) configured for pushing the upper lip (101) away from the lower lip (102), in the first angular range and in the second angular range, respectively, during said first full rotation and during said second full rotation.
- The knotter system of any one of the previous claims, further comprising:a twine receiver (200) configured for holding the needle twine and the tucker twine;a swing arm (400) adapted for cutting twines between the billhook (100) and the twine receiver (200);said drive means being further configured to move the swing arm (400) a first time from a rest position to an extended position and back during the first knot forming cycle and a second time during the second knot forming cycle.
- The knotter system of claim 15, wherein the swing arm (400) is configured for sweeping a formed knot from the billhook (100) during the first knot forming cycle and during the second knot forming cycle, respectively.
- The knotter system claim 15 or 16, wherein the twine receiver (200) is adapted to let the twines slip during the second knot forming cycle so that cutting of the needle (11) and tucker twine is avoided when forming the second knot.
- Knotter system of any one of the claims 15-17, wherein said drive means comprise a cam track (440) and a cam follower (430), said cam follower (430) being connected with the swing arm (400), and said cam track (440) being provided in said disc (501) or in a member mounted for rotating synchronously with said disc (501), and being adapted for moving the swing arm (400) a first time and a second time during the first and the second knot forming cycle, respectively.
- Baler comprising a plurality of knotter systems according to any of the previous claims.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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BE2017/5308A BE1024808B1 (en) | 2017-05-02 | 2017-05-02 | BUTTON SYSTEM FOR A BALEN PRESS |
PCT/EP2018/060960 WO2018202594A1 (en) | 2017-05-02 | 2018-04-27 | Knotter system for a baler |
Publications (2)
Publication Number | Publication Date |
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EP3618606A1 EP3618606A1 (en) | 2020-03-11 |
EP3618606B1 true EP3618606B1 (en) | 2022-10-12 |
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Family Applications (1)
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EP18722447.2A Active EP3618606B1 (en) | 2017-05-02 | 2018-04-27 | Knotter system for a baler |
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US (1) | US11425864B2 (en) |
EP (1) | EP3618606B1 (en) |
CN (1) | CN110248537B (en) |
BE (1) | BE1024808B1 (en) |
WO (1) | WO2018202594A1 (en) |
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US11666003B2 (en) | 2018-12-21 | 2023-06-06 | Agco Corporation | Quick-release lock for baler knotter head |
CN110786147A (en) * | 2019-11-29 | 2020-02-14 | 宁波市鄞州金本机械有限公司 | Knotter for agricultural bundling machine |
GB202011846D0 (en) * | 2020-07-30 | 2020-09-16 | Kuhn Geldrop Bv | Binding system and method |
CN112385399A (en) * | 2020-08-19 | 2021-02-23 | 江苏大学 | Coaxial reverse double-fluted-disc driving knotter |
CN112675505B (en) * | 2021-01-07 | 2022-06-14 | 王成军 | Automatic knotting device |
EP4039081A1 (en) * | 2021-02-04 | 2022-08-10 | Rasspe Systemtechnik GmbH | Yarn knot and method for forming two knots in a yarn |
CN113455202B (en) * | 2021-06-04 | 2022-09-13 | 江苏大学 | Identical-tooth-direction double-fluted-disc driving knotter and bundling machine provided with same |
CN114600649B (en) * | 2021-06-16 | 2023-02-21 | 山东登海种业股份有限公司 | Bundling machine and grain combine based on packaging process |
CN117859504B (en) * | 2024-02-29 | 2024-07-19 | 东北农业大学 | Harvesting and binding machine for crops in hilly land |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE20316967U1 (en) * | 2003-11-03 | 2005-03-17 | Rasspe Systemtechnik Gmbh & Co | Twine knotter for baler has jaws mounted on vertical shaft which rotates about its axis, lower jaw consisting of double-armed lever with wheel on its rear end which rolls over cam which is separate from machine frame |
GB0407858D0 (en) * | 2004-04-07 | 2004-05-12 | Cnh Belgium Nv | Double knotting system for an agricultural baler |
US7752959B1 (en) * | 2009-06-08 | 2010-07-13 | Deere & Company | Knotter frame serving as lubrication manifold |
CN102665387B (en) * | 2009-11-03 | 2016-02-24 | 腊斯佩系统技术有限两合公司 | Double-knot twine knotter unit |
CN202873378U (en) * | 2012-04-21 | 2013-04-17 | 中国农业机械化科学研究院呼和浩特分院 | Composite type knotter |
RU2599644C2 (en) * | 2012-06-14 | 2016-10-10 | Расспе Зюстемтехник Гмбх | Twine knotter |
BE1021116B1 (en) | 2012-10-16 | 2016-01-18 | Cnh Industrial Belgium Nv | BUTTON SYSTEM FOR A BALEN PRESS |
BE1021102B1 (en) * | 2013-07-31 | 2016-01-12 | Cnh Industrial Belgium Nv | KNOTER SYSTEM WITH AN IMPROVED TWO WIRE OPNER |
CN104823607B (en) * | 2015-04-03 | 2017-05-31 | 江苏大学 | A kind of bidentate dish driving knotter |
-
2017
- 2017-05-02 BE BE2017/5308A patent/BE1024808B1/en active IP Right Grant
-
2018
- 2018-04-27 US US16/610,367 patent/US11425864B2/en active Active
- 2018-04-27 CN CN201880009075.2A patent/CN110248537B/en active Active
- 2018-04-27 WO PCT/EP2018/060960 patent/WO2018202594A1/en unknown
- 2018-04-27 EP EP18722447.2A patent/EP3618606B1/en active Active
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BE1024808B1 (en) | 2018-07-03 |
CN110248537B (en) | 2022-04-05 |
EP3618606A1 (en) | 2020-03-11 |
CN110248537A (en) | 2019-09-17 |
US20200137960A1 (en) | 2020-05-07 |
WO2018202594A1 (en) | 2018-11-08 |
US11425864B2 (en) | 2022-08-30 |
BR112019023054A2 (en) | 2020-06-09 |
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